JP2000160687A - Construction method for composite structure and precast concrete column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method by which the construction period of a composite structure constituted of reinforced concrete columns and steel beams can be shortened. SOLUTION: Concrete is placed in a position forming the bottom of a footing 32 to construct a concrete bottom plate 16, and then, a skeleton unit 18 is erected on the concrete bottom plate 16. The skeleton unit 18 is provided with reinforcements, steel frames 22, and connections attached to the upper part of the steel frames 22. The steel frame 22 is a temporary frame for jointing beams and it does not function as a member to support the load of a building. Then, a girder 28 is connected to the connection part 26 and subsequently, concrete forms are assembled at the periphery of the skeleton unit 18 and works such as a floor work or the like are advanced. reinforcements of footing beams or footings 32 are arranged or concrete forms are assembled simultaneously with works on the ground as above. In this way, a series of construction works for a foundation part are carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a mixed structure in which columns are RC structures and beams are S structures, a method of constructing a mixed structure in which columns are precast RC structures and beams are S structures, and a method thereof. Precast concrete columns used in the method.

[0002]

2. Description of the Related Art Conventionally, in the case of constructing a mixed structure in which pillars are made of RC (reinforced concrete) and beams are made of S (steel frame), as shown in FIG. And footing 104 bar arrangement work, formwork work,
After the concrete is cast and the foundations such as the underground beam 102 and the footing 104 are constructed, the work of arranging the columns on the ground, the work of assembling the formwork, the casting of the concrete, and the beam to the connection 106 are performed. It is general to start the connection and joining work of the 108. Precast RC columns
(Precast reinforced concrete), and the beam is S
In the case of constructing a mixed structure made of steel (steel frame construction), first, as shown in FIG. 6, a reinforcing work of the underground beam 102 and the footing 104, a formwork operation, and a concrete placing operation are performed on the ground portion. After constructing the foundation such as the underground beam 102 and the footing 104, the precast reinforced concrete columns 110 are installed on the ground. The installation of the precast reinforced concrete columns 110 is performed by changing the reinforcing steel fixed to the footing 104 to the precast reinforced concrete columns 110.
After that, it is common to insert into a joint 112 buried at the lower end of the floor, and then start the subsequent steps on the ground floor, such as connection of the beam 108 to the connection 106 and joining work.

[0003]

Therefore, when a mixed structure composed of RC columns and S-structured beams is constructed by a conventional construction method, after a foundation such as an underground beam or a footing is constructed in the ground portion, Otherwise, the construction of the skeleton above the ground could not be started, which was disadvantageous in shortening the construction.
In addition, when a mixed structure composed of precast RC columns and S-structured beams is constructed by a conventional construction method, similar to the above, unless a foundation such as an underground beam or a footing is constructed in the ground portion, It was not possible to start construction of the skeleton on the ground, which was disadvantageous in shortening the construction. The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a construction method capable of shortening a construction period of a mixed structure including RC columns and S beams. . Another object of the present invention is to provide a construction method capable of shortening the construction period of a building skeleton mixed structure including precast RC columns and S beams. Another object of the present invention is to provide a precast concrete column which is suitable for use in constructing a building frame mixed structure including a precast RC column and an S beam.

[0004]

In order to achieve the above object, according to the present invention, when constructing a mixed structure in which a pillar is made of RC and a beam is made of S, concrete is poured into a portion forming a bottom of a footing. A concrete bottom plate is constructed, and a framing unit is erected on the concrete bottom plate.The framing unit is connected to the concrete bottom plate at a lower end, and is wrapped around a steel frame supporting a connection at an upper portion, and the steel frame. It is equipped with a reinforcing bar consisting of a pillar main bar and a columnar bar, and then, the connection of the beam to the connection, the joining work, the assembling work of the concrete formwork around the frame unit, etc., and at the same time, In the ground portion, it is characterized in that the foundation work such as the arrangement of underground beams and footing reinforcement and the assembly of concrete formwork is advanced. Also, the present invention
The steel bar is wound around the steel frame after a steel frame is erected on the concrete bottom plate. Also,
The present invention is characterized in that, when the steel frame becomes a reinforced concrete column when concrete is poured into the frame unit,
It does not function as a member that supports the load of the structure, and can maintain the standing state of the framing unit on the concrete bottom plate in a state where a beam is connected to and joined to the connection before it becomes the reinforced concrete column. It is characterized by being formed with strength and rigidity. In addition, the present invention has a connection in the upper part of the column-shaped concrete block in which the reinforcing steel is embedded, and a lower part of the concrete block in building a mixed structure in which the pillar is made of precast RC and the beam is made of S. A precast concrete column in which a steel frame is buried is provided, and the steel frame projects downward from a lower end of the concrete block, and concrete is poured into a portion forming a bottom portion of a footing, and a concrete bottom plate is constructed. At the top, the lower end of the steel frame is connected to form a precast concrete column, and then the beam is connected to and joined to the connection, and at the same time, the underground beams and footing are arranged on the ground. It is characterized in that basic construction such as assembling streaks and concrete forms is advanced. In addition, the present invention does not function as a member for supporting the load of the structure when the steel frame has an underground beam or footing formed on the ground portion, and the underground beam or footing is formed on the ground portion. Before the connection, a beam is connected to the connection and joined, and the precast concrete column is formed with strength and rigidity capable of maintaining the standing state of the precast concrete column on the concrete bottom plate. Further, the present invention is a precast concrete column having a columnar concrete block formed by placing concrete after reinforcing bars are laid, and a connection provided at an upper portion of the concrete block, wherein the concrete A steel frame for erection of the concrete block is embedded in a lower portion of the block, a lower portion of the steel frame protrudes below a lower surface of the concrete block, and the lower portion of the concrete block is an underground beam of a ground portion. In the state where it is connected to the footing, it does not function as a member that supports the load of the structure, and before it is connected to the underground beam or footing of the ground part, the beam is connected to the connection and joined Strength to maintain the standing condition of the precast concrete columns,
It is characterized by being formed with rigidity. Further, the present invention is characterized in that the rebar projects below the lower surface of the concrete block.

[0005] According to the method of constructing a mixed structure in which the pillars are made of RC and the beams are made of S, and the method of constructing a mixed structure in which the columns are made of precast RC and the beams are made of S, Before the foundation such as the beam and the footing is constructed, it is possible to start the framing work of the terrestrial part, so that the start time of the framing work of the terrestrial part can be advanced.
In addition, if the precast concrete column of the present invention is used, when constructing a mixed structure in which the column is made of precast RC and the beam is made of S, before the foundation such as underground beams and footing is constructed, Can be started, and the start time of the erection work on the ground can be advanced.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, a description will be given of the first embodiment in which a mixed structure in which columns are RC structures (reinforced concrete structures) and beams are S structures (steel frame structures) is constructed. FIG. 1 (A)
2 is a front view of a state in which a frame unit is erected on a concrete bottom plate, FIG. 2B is a cross-sectional plan view of the frame unit, FIG.
Shows a front view of the reinforced concrete column after the foundation and the ground have been constructed. As shown in FIG. 1, a plurality of reinforced concrete columns 12
(See FIG. 2), the foundation beam 14 to be constructed
The concrete bottom plate 16 is constructed by pouring concrete so as to be located below (see FIG. 2), that is, at a position forming the bottom of the footing 32 (see FIG. 2). The reinforced concrete column 12 is a skeleton unit 1
After the concrete bottom plate 16 is constructed, the frame unit 18 is erected on the concrete bottom plate 16. Frame unit 18
Comprises a reinforcing bar 20 composed of a column main bar 2002 and a columnar bar 2004, a steel frame 22, and a connection 26 attached to an upper portion of the steel frame 22, and the connection 26 has a beam steel frame arranged in a cross shape. It is formed. As the steel frame 22, an I-beam, an H-beam, or a plate assembled is used, and a band plate 24 is attached above and below a connection 26.

A flange 2202 is provided at the lower end of the steel frame 22. For example, an embedded bolt of the concrete bottom plate 16 is inserted into a bolt insertion hole of the flange 2202, and a nut is screwed into the flange 2202 from the upper surface of the flange.
Is fastened to the concrete bottom plate 16 so that the frame unit 18 is erected on the concrete bottom plate 16. The cross-sectional shape of the steel frame 22 is formed to have a size sufficient to support the girder 28 in a state where the girder 28 is joined to the connection 26.
That is, the steel frame 22 is provided so as to be able to maintain the erected state of the frame unit 18 in a state where the girder 28 is connected to the connection 26 after the erected frame unit 18 is erected. Things. for that reason,
After the concrete is cast into the reinforced concrete columns 12, the steel frame 22 does not function as a member for supporting the load of the structure.

As shown in FIG. 1B, at least four pillar main bars 2002 are arranged so as to be located at the vertices of a rectangle around the steel frame 22, and the upper part thereof is connected to a pillar on the upper floor. It protrudes above the connection 26. The column reinforcements 2004 are arranged so as to connect the column main reinforcements 2002 at a number of locations vertically spaced between the lower end of the steel frame 22 and the connection 26. In addition, these pillar main bars 2002
And the column stirrup 2004 may be assembled and integrated with the steel frame 22 in advance, or after the steel frame 22 is erected,
You may make it attach to the steel frame 22. In FIG. 1A, reference numeral 30 denotes a tiger rope, and the tiger rope 30 is used to secure the verticality of the frame unit 18 as necessary.

If the frame unit 18 is erected on the concrete bottom plate 16 as described above, as shown in FIG. 2, the girder 28 is connected to the connection 26 and the reinforcing plate 280 is provided.
The joint work between the connection 26 and the girder 28 is performed by using 2 or the like, then a concrete formwork is assembled around the framing unit 18, and the work such as floor work is performed. At the same time, the reinforcement of the underground beam 14 and the footing 32 and the assembling of the concrete formwork are performed in parallel with the above-mentioned work on the ground. Then, the concrete is cast and a series of works of the foundation such as the underground beam 14 and the footing 32 are constructed, and the concrete is cast into the concrete formwork surrounding the framing unit 18 to form the reinforced concrete column 12. Execute.

As described above, according to the present embodiment, the steel frame 2
Since the frame unit 18 having the connection 2 and the connection 26 is used, on the ground portion, connection and joining work of the girder 28,
The work of assembling the concrete formwork around the frame unit 18 is advanced, and the underground beam 1
4 and footing 32, and foundation work such as assembling a concrete formwork can be simultaneously advanced. Therefore, according to the present embodiment, it is possible to start the construction work of the above-ground part in parallel with the construction work of the foundation part such as the underground beam and the footing, and to start the construction of the above-ground part before the foundation part is constructed. The construction work can be started, the start time of the construction work of the skeleton on the ground portion is advanced, and the entire construction time in the mixed structure in which the columns are RC structures and the beams are S structures can be shortened.

Next, a description will be given of a second embodiment in which a precast pillar is made of RC (precast reinforced concrete) and the beam is made of S (steel). FIG. 3 (A) is a front view of a state where a precast reinforced concrete column is erected on a concrete bottom plate,
(B) is a cross-sectional plan view of the precast reinforced concrete column, and FIG. 4 is a front view of the precast reinforced concrete column after the foundation portion and the ground portion have been constructed. The same parts and members as those in the above embodiment will be described with the same reference numerals. As shown in FIG. 3, at the time of foundation work of a building, immediately below a plurality of precast reinforced concrete columns 42 to be constructed (see FIG. 4). At the location of the foundation beam 14 to be constructed (Fig. 4
), Ie footing 3
Concrete is cast into each of the bottom portions 2 (see FIG. 4), and a concrete bottom plate 16 is constructed. When the concrete bottom plate 16 is constructed, the precast reinforced concrete columns 42 are placed on the concrete bottom plate 16.
Is established. The precast reinforced concrete columns 42
A prismatic concrete block 44 formed by placing concrete in advance after reinforcing bars 50 are arranged in a factory.
A steel frame 52 is provided at the lower part of the concrete block 44, and a connection 56 is provided at the upper part of the concrete block 44.
The connection 56 is formed by arranging beam steel frames in a cross shape.

The steel frame 52 has an upper half buried under the concrete block 44 and a lower half protruding downward from the lower surface of the concrete block 44. As the steel frame 52, an I-beam, an H-beam or a plate assembled with plates is used. A flange 5202 is provided at the lower end of the steel frame 52. For example, an embedded bolt of the concrete bottom plate 16 is inserted into a bolt insertion hole of the flange 5202, a nut is screwed from the upper surface of the flange, and the flange 5202 is fastened to the concrete bottom plate 16. Thus, the precast reinforced concrete columns 42 are erected on the concrete bottom plate 16. The cross-sectional shape of the steel frame 52 and the depth buried in the concrete block 44 are determined to be large enough to support the girder 28 with the girder 28 joined to the connection 56. That is, the steel frame 52 is provided so that the precast reinforced concrete column 42 can be maintained in the state where the precast reinforced concrete column 42 is erected on the concrete bottom plate 16 and then the beam 56 is connected to the connection 56. This is a temporary connection. Therefore, the steel frame 52 is buried only in the lower part of the concrete block 44, and after the foundation beam 14 and the footing 32 are constructed, the steel frame 52 does not function as a member for supporting the load of the structure.

The reinforcing bar 50 is composed of a column main bar 5002 and a column band bar 5004. As shown in FIG. 3B, at least four column main bars 2002 are arranged so as to be located at the vertices of a rectangle around the steel frame 52. The upper part protrudes above the connection 26 so as to be connected to the pillar on the upper floor, and the lower part protrudes below the concrete block 44 so as to be connected to the foundation beam 14 and the footing 32. The column stirrups 2004 are arranged so as to connect the column main stirrups 2002 at a number of locations spaced apart in the vertical direction.
In FIG. 3A, reference numeral 60 denotes a diagonal support, and the diagonal support 60 is used to secure the verticality of the precast reinforced concrete column 42 as necessary.

If the precast reinforced concrete columns 42 are erected on the concrete bottom plate 16 as described above,
As shown in FIG. 4, the girder 28 is connected to the connection 56, and the connection between the connection 56 and the girder 28 is performed using a reinforcing plate 2802 or the like. In parallel with the above-mentioned work on the ground, in the ground, reinforcement of the underground beams 14 and the footing 32 and assembly of the concrete formwork are performed. Then, concrete is cast and a series of works of the foundation such as the underground beam 14 and the footing 32 are performed.

As described above, according to the present embodiment, the steel frame 5
Since the precast reinforced concrete columns 42 having the connection 2 and the connection 56 are used, the connection and joining work of the girders 28 are advanced on the ground portion, and the underground beams 1 are formed on the ground portion.
4 and footing 32, and foundation work such as assembling a concrete formwork can be simultaneously advanced. Therefore, according to the present embodiment, it is possible to start the construction work of the above-ground part in parallel with the construction work of the foundation part such as the underground beam and the footing, and to start the construction of the above-ground part before the foundation part is constructed. It is possible to start construction work, hasten the start of building work on the ground, and precast RC columns
(Precast reinforced concrete), and the beam is S
It is possible to shorten the entire construction period of the mixed structure made of steel (steel frame).

The shapes of the steel frames 22, 52 and the steel frames 22,
Various structures for connecting the 52 to the concrete bottom plate 16 are conceivable, and are not limited to the structure of the embodiment.

[0017]

As is apparent from the above description, the present invention
A method of constructing a mixed structure in which the pillars are RC structures and the beams are S structures is that concrete is cast at a location forming the bottom of the footing, a concrete bottom plate is constructed, and a framing unit is erected on the concrete bottom plate. The frame unit has a steel frame having a lower end connected to the concrete bottom plate and supporting a connection at an upper portion thereof, and a reinforcing bar including a column main bar and a column bar bar wound around the steel frame. Connection of beams to the connection, joining work, assembling of concrete formwork around the frame unit, etc., and at the same time, in the ground part, reinforcement of underground beams and footing and concrete formwork The foundation work such as the assembly of the building was advanced. Also, the method of the present invention for constructing a mixed structure in which the columns are made of precast RC and the beams are made of S is provided with a connection at an upper part of a columnar concrete block in which a reinforcing bar is embedded and a lower part of the concrete block. A precast concrete column in which a steel frame is embedded is provided, and the steel frame protrudes downward from the lower end of the concrete block. On the bottom plate, connect the lower end of the steel frame to erect a precast concrete column, and then connect the beam to the connection,
At the same time, joint work was carried out, and at the same time, foundation work such as reinforcement of underground beams and footing and assembling of concrete formwork were advanced in the ground. Further, in the precast concrete pillar of the present invention, a steel frame for erection of the concrete block is embedded in a lower portion of the concrete block, a lower portion of the steel frame projects below a lower surface of the concrete block, and the steel frame is In the state where the lower part of the concrete block is connected to the underground beam and footing of the ground, it does not function as a member that supports the load of the structure, and before it is connected to the underground beam and footing of the ground,
When the beam is connected to and joined to the connection, the precast concrete column is formed with sufficient strength and rigidity to maintain the standing state. Therefore, it is possible to start the framing work of the above-ground part before the foundation part is built, so that the start time of the framing work of the above-ground part can be accelerated, and the overall construction time of the mixed structure can be shortened. Become.

[Brief description of the drawings]

FIG. 1A is a front view of a state in which a frame unit is erected on a concrete bottom plate, and FIG. 1B is a cross-sectional plan view of the frame unit.

FIG. 2 is a front view of a reinforced concrete pillar portion after a foundation portion and a ground portion have been constructed.

FIG. 3A is a front view of a state in which a precast reinforced concrete column is erected on a concrete bottom plate, and FIG. 3B is a cross-sectional plan view of the precast reinforced concrete column.

FIG. 4 is a front view of a precast reinforced concrete pillar portion after a foundation portion and a ground portion have been constructed.

FIG. 5 is an explanatory diagram of a case where a mixed structure in which columns are RC structures and beams are S structures is constructed by a conventional method.

FIG. 6 is an explanatory view of a case where a mixed structure in which columns are made of precast RC and beams are made of S is constructed by a conventional method.

[Explanation of symbols]

 12 Reinforced concrete pillars 14 Foundation beam 16 Concrete bottom plate 18 Frame unit 20, 50 Reinforcement 22, 52 Steel frame 26, 56 Connection 28 Giant beam 32 Footing 42 Precast reinforced concrete pillar 44 Concrete block

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04B 1/58 511 E04B 1/58 511A

Claims (7)

[Claims] When constructing a mixed structure in which a pillar is made of RC and a beam is made of S, concrete is poured into a portion forming a bottom of a footing and a concrete bottom plate is constructed, and a frame is formed on the concrete bottom plate. A unit is erected, the frame unit is provided with a steel frame having a lower end connected to the concrete bottom plate and supporting a connection at an upper portion, and a reinforcing bar including a column main bar and a column bar bar wound around the steel frame. Next, work such as connecting and joining beams to the connection and assembling a concrete formwork around the frame unit are performed. At the same time, in the ground portion, reinforcement of underground beams and footing is provided. A method of constructing a mixed structure, characterized in that foundation work such as assembling of concrete and concrete formwork is advanced. 2. The method according to claim 1, wherein the rebar is wound around the steel frame after a steel frame is erected on the concrete bottom plate. 3. The steel frame does not function as a member for supporting the load of a structure when concrete is cast into the framing unit to form a reinforced concrete column. 3. The mixed structure according to claim 1, wherein in a state where a beam is connected to and joined to the connection, the structure is formed with sufficient strength and rigidity to maintain an upright state of the frame unit on the concrete bottom plate. 4. How to build. 4. When constructing a mixed structure in which a column is made of precast RC and a beam is made of S, a connection is provided at an upper portion of a columnar concrete block in which a reinforcing bar is embedded, and a steel frame is provided at a lower portion of the concrete block. The steel frame protrudes downward from the lower end of the concrete block, and concrete is cast at a location forming the bottom of the footing, and a concrete bottom plate is constructed. Then, a precast concrete column is erected by connecting the lower ends of the steel frames, and then a beam is connected and joined to the connection, and at the same time, in the ground portion, underground beams and footing reinforcement are provided. The construction method of a mixed structure characterized by the fact that foundation work such as assembling of concrete and concrete formwork is advanced. 5. When the underground beam or footing is constructed on the ground, the steel frame does not function as a member for supporting the load of the structure, and the underground beam or footing is constructed on the ground. 5. The precast concrete column is formed to have strength and rigidity to maintain the standing state of the precast concrete column on the concrete bottom plate in a state where a beam is connected to and joined to the connection before the connection. A method for constructing the described mixed structure. 6. A precast concrete column having a columnar concrete block formed by casting concrete after reinforcing bars are laid, and a precast concrete column having a connection provided on an upper portion of the concrete block. A steel frame for erection of the concrete block is buried in a lower portion of the concrete block, a lower portion of the steel frame projects below a lower surface of the concrete block, and a lower portion of the concrete block has In the state where it is connected to the footing, it does not function as a member that supports the load of the structure, and before it is connected to the underground beam or footing of the ground portion, in the state where the beam is connected to the connection and joined, The precast concrete column is formed with strength and rigidity capable of maintaining the standing state of the precast concrete column, REIT posts. 7. The precast concrete column according to claim 6, wherein the reinforcing bar projects below a lower surface of the concrete block.